Question

ɔ Most dialects of American English have replaced this sound with [ɑ], except before [ɹ] and/or [l], as in door and talk. In these dialects cot and caught are pronounced the same way: [kɑt] (known as the COT-CAUGHT merger). Some North-American dialects distinguish cot [kɑt] and caught [kɔt]. In these dialects these words have [ɔ]: thought, bought, law, saw, broad, talk, bought, thought, draw, dawn, awful, pause, caught, haunt, fault, coffee, off, boss, lost, crossed.

Accepted Answer

Open-mid Back Rounded http://en.wikipedia.org/wiki/Open-mid_back_rounded_vowel

Symbol	ɔ
Name	Open-mid Back Rounded
Notes	Most dialects of American English have replaced this sound with [ɑ], except before [ɹ] and/or [l], as in door and talk. In these dialects cot and caught are pronounced the same way: [kɑt] (known as the COT-CAUGHT merger). Some North-American dialects distinguish cot [kɑt] and caught [kɔt]. In these dialects these words have [ɔ]: thought, bought, law, saw, broad, talk, bought, thought, draw, dawn, awful, pause, caught, haunt, fault, coffee, off, boss, lost, crossed.
Ref	http://en.wikipedia.org/wiki/Open-mid_back_rounded_vowel

Ght Aw O Dialects Ou Au B Back